Nest heat link wiring

[Matthewlondon7]

So I’ve bought a nest 3rd gen to add to my old valiant boiler.My brother is quite handy with electrical stuff and such so I asked his advice for wiring. He said this .

From what I can tell the Nest Heat Link (controller) has identical wiring, so you’d just need to replicate the wiring that you currently have for the Drayton controller, i.e. Blue to N, Brown to L, then a loop between L and 1, 2 is not used, the wire with sleeve to 3, and then Green/Yellow to the Earthing point.

I’ve wired it up fixed in place and done the app connection but it’s not calling for heat and won’t start the boiler have we got the wiring wrong ? Any advice please I have included a picture of the old Drayton wiring configuration.

 

[Loki]

Here's screen shots for combi install from nest.

Link wire goes from L to 2

 

[James]

as above, if you have copied exactly the wire connections, number to number from one stat to the other.

you need to take the loop out of terminal 1 and put it in terminal 2

can you post a pic of the connections you have made to the new nest unit?
this should help us confirm that the above educated guess is correct.